201.0 (CQ51A, A02010) Cast Aluminum
201.0 aluminum is an aluminum alloy formulated for casting. 201.0 is the Aluminum Association (AA) designation for this material. A02010 is the UNS number. Additionally, the SAE designation is 382. Older literature may refer to this material as ASTM CQ51A, but this is now discouraged.
It has the highest base cost among the ANSI/AA cast aluminums in the database.
The properties of 201.0 aluminum include three common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare 201.0 aluminum to: ANSI/AA cast aluminums (top), all aluminum alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Brinell Hardness
95 to 140
Elastic (Young's, Tensile) Modulus
71 GPa 10 x 106 psi
Elongation at Break
4.4 to 20 %
Fatigue Strength
120 to 150 MPa 18 to 21 x 103 psi
Impact Strength: V-Notched Charpy
10 to 22 J 7.4 to 16 ft-lb
Poisson's Ratio
0.33
Shear Modulus
27 GPa 3.9 x 106 psi
Shear Strength
290 MPa 42 x 103 psi
Tensile Strength: Ultimate (UTS)
370 to 470 MPa 53 to 68 x 103 psi
Tensile Strength: Yield (Proof)
220 to 400 MPa 31 to 59 x 103 psi
Thermal Properties
Latent Heat of Fusion
390 J/g
Maximum Temperature: Mechanical
170 °C 340 °F
Melting Completion (Liquidus)
650 °C 1200 °F
Melting Onset (Solidus)
570 °C 1060 °F
Solidification (Pattern Maker's) Shrinkage
1.3 %
Specific Heat Capacity
870 J/kg-K 0.21 BTU/lb-°F
Thermal Conductivity
120 W/m-K 70 BTU/h-ft-°F
Thermal Expansion
19 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
30 to 33 % IACS
Electrical Conductivity: Equal Weight (Specific)
87 to 97 % IACS
Otherwise Unclassified Properties
Base Metal Price
38 % relative
Calomel Potential
-670 mV
Density
3.1 g/cm3 190 lb/ft3
Embodied Carbon
8.7 kg CO2/kg material
Embodied Energy
160 MJ/kg 69 x 103 BTU/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
19 to 63 MJ/m3
Resilience: Unit (Modulus of Resilience)
330 to 1160 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
45 points
Strength to Weight: Axial
33 to 42 points
Strength to Weight: Bending
37 to 44 points
Thermal Diffusivity
45 mm2/s
Thermal Shock Resistance
19 to 25 points
Alloy Composition
Among cast aluminum alloys, the composition of 201.0 aluminum is notable for including silver (Ag) and containing a comparatively high amount of copper (Cu). Silver is used to improve strength and resistance to stress corrosion cracking. Copper is used to improve strength. This comes at the cost of a decrease in corrosion resistance and weldability.
| Al | 92.1 to 95.1 | |
| Cu | 4.0 to 5.2 | |
| Ag | 0.4 to 1.0 | |
| Mg | 0.15 to 0.55 | |
| Mn | 0.2 to 0.5 | |
| Ti | 0.15 to 0.35 | |
| Fe | 0 to 0.15 | |
| Si | 0 to 0.1 | |
| res. | 0 to 0.1 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM B618: Standard Specification for Aluminum-Alloy Investment Castings
ASTM B26: Standard Specification for Aluminum-Alloy Sand Castings
Handbook of Aluminum Bonding Technology and Data, J. D. Minford, 1993
Advanced Materials in Automotive Engineering, Jason Rowe (editor), 2012
ASM Specialty Handbook: Aluminum and Aluminum Alloys, J. R. Davis (editor), 1993